Standard Pack = 1 piece(s). Coating = Aluminum Titanium Nitride; Diameter = 5/16, 0.3125 IN ; Center Cutting; Finish = ALTiN; Flute Length = 13/16; Flute Type = 30 Degree Helix; Material = Carbide; Number of Flutes = 3 IN ; Overall Length = 2-1/2; Shank Diameter = 2-1/2;